GitHub
GitHub
About
AdoptOpenJDK builds
Getting started
New to OpenJ9?
Release notes
Release notes
Version 0.14.2
Version 0.14.0
Version 0.13.0
Version 0.12.1
Version 0.12.0
Version 0.11.0
Version 0.10.0
Version 0.9.0
Version 0.8.0
Garbage Collection
JIT Compiler
AOT Compiler
Class data sharing
Diagnostics
Diagnostics
Tools and data
Java dump
Heap dump
System dump
Command-line options
Command-line options
Specifying options
Standard options
Switching to OpenJ9
System property options
System property options
Using System properties
-Dcom.ibm.enableClassCaching
-Dcom.ibm.enableLegacyDumpSecurity
-Dcom.ibm.enableLegacyLogSecurity
-Dcom.ibm.enableLegacyTraceSecurity
-Dcom.ibm.lang.management.OperatingSystemMXBean.isCpuTime100ns
-Dcom.ibm.lang.management.verbose
-Dcom.ibm.tools.attach.directory
-Dcom.ibm.tools.attach.displayName
-Dcom.ibm.tools.attach.enable
-Dcom.ibm.tools.attach.id
-Dcom.ibm.tools.attach.timeout
-Dfile.encoding
-Djava.compiler
-Djdk.nativeCBC
-Djdk.nativeCrypto
-Djdk.nativeDigest
-Djdk.nativeGCM
-Djdk.nativeRSA
JVM -X options
JVM -X options
Using -X options
-X
-Xaggressive
-Xalwaysclassgc
-Xaot
-Xargencoding
-Xbootclasspath
-XCEEHDLR
-Xcheck
-Xclassgc
-Xcodecache
-Xcodecachetotal
-Xcomp
-Xcomp
On this page ...
Syntax
-Xcompactexplicitgc
-Xcompactgc
-XcompilationThreads
-Xcompressedrefs
-Xconcurrentbackground
-Xconcurrentlevel
-Xconcurrentslack
-Xconmeter
-Xdiagnosticscollector
-Xdisableexcessivegc
-Xdisableexplicitgc
-Xdisablejavadump
-Xdisablestringconstantgc
-Xdump
-Xenableexcessivegc
-Xenableexplicitgc
-Xenablestringconstantgc
-Xfastresolve
-Xfuture
-Xgc
-Xgc:splitheap
-Xgcpolicy
-Xgcthreads
-Xgcworkpackets
-Xifa
-Xint
-Xiss
-Xjit
-Xjni
-Xlinenumbers
-Xloa
-Xloainitial
-Xloamaximum
-Xloaminimum
-XlockReservation
-Xlockword
-Xlog
-Xlp
-Xlp:codecache
-Xlp:objectheap
-Xmaxe
-Xmaxf
-Xmaxt
-Xmca
-Xmco
-Xmcrs
-Xmine
-Xminf
-Xmint
-Xmn
-Xmns
-Xmnx
-Xmo
-Xmoi
-Xmos
-Xmox
-Xmr
-Xmrx
-Xms
-Xmso
-Xmx
-Xnoaot
-Xnoclassgc
-Xnocompactexplicitgc
-Xnocompactgc
-Xnocompressedrefs
-Xnojit
-Xnolinenumbers
-Xnoloa
-Xnosigcatch
-Xnosigchain
-Xnuma:none
-Xoptionsfile
-Xquickstart
-Xrs
-XsamplingExpirationTime
-Xscdmx
-Xscmaxaot
-Xscmaxjitdata
-Xscminaot
-Xscminjitdata
-Xscmx
-Xshareclasses
-Xsigcatch
-Xsigchain
-Xsignal
-Xsoftmx
-Xsoftrefthreshold
-Xss
-Xssi
-Xtgc
-Xthr
-XtlhPrefetch
-Xtrace
-Xtune:virtualized
-Xverbosegclog
-Xverify
-Xzero
JVM -XX options
JVM -XX options
Using -XX options
-XXActiveProcessorCount
-XXallowvmshutdown
-XX:codecachetotal
-XX:[+|-]DisableExplicitGC
-XX:[+|-]DisclaimJitScratch
-XX:[+|-]EnableCPUMonitor
-XX:[+|-]handleSIGXFSZ
-XX:[+|-]HeapDumpOnOutOfMemory
-XX:HeapDumpPath
-XX:[+|-]HeapManagementMXBeanCompatibility
-XX:[+|-]IdleTuningCompactOnIdle
-XX:[+|-]IdleTuningGcOnIdle
-XX:IdleTuningMinFreeHeapOnIdle
-XX:IdleTuningMinIdleWaitTime
-XX:[+|-]IgnoreUnrecognizedVMOptions
-XX:[+|-]IgnoreUnrecognizedXXColonOptions
-XX:InitialRAMPercentage
-XX:InitialHeapSize
-XX:[+|-]InterleaveMemory
-XX:[+|-]JITInlineWatches
-XX:[+|-]LazySymbolResolution
-XX:MaxDirectMemorySize
-XX:MaxHeapSize
-XX:MaxRAMPercentage
-XXnosuballoc32bitmem
-XX:[+|-]PageAlignDirectMemory
-XX:[+|-]PositiveIdentityHash
-XX:[+|-]ReadIPInfoForRAS
-XX:[+|-]ReduceCPUMonitorOverhead
-XX:[+|-]RuntimeInstrumentation
-XXsetHWPrefetch
-XX:ShareClassesDisableBCI
-XX:ShareClassesEnableBCI
-XX:SharedCacheHardLimit
-XX:-StackTraceInThrowable
-XX:[+|-]UseCompressedOops
-XX:[+|-]UseContainerSupport
-XX:[+|-]UseNoGC
-XX:[+|-]VerboseVerification
-XX:[+|-]VMLockClassLoader
Tools
Tools
Dump viewer
Trace formatter
Option builder
Java process status (jps) tool
Java stack (jstack) tool
Switching to OpenJ9
Reference
Reference
Supported environments
Default settings
Directory conventions
OpenJ9 messages
Environment variables
Legal
On this page ...
Syntax
-Xcomp
The use of this option is deprecated; use
-Xjit:count=0
instead.
Syntax
-Xcomp